Abstract
The onset and initial progress of atmospheric corrosion of ternary alloyed Zn–Mg–Al coatings induced by an aqueous sodium chloride environment was studied in detail by means of surface sensitive techniques, X-ray photoelectron spectroscopy and Auger electron spectroscopy. Two fundamental processes were found to be involved in the initial corrosion attack: (i) dissolution of the surface layer consisting of MgO and (ii) preferential anodic dissolution of both, binary and ternary eutectic phases constituting the coating, which led to the formation of characteristic cracks/holes and was followed by a predominant deposition of zinc corrosion products around anodic regions.
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